基于热弹流润滑轴承模型的三缸机NVH性能预测与优化  

NVH Performance Prediction and Optimization for a 3-cylinder Engine Based on Thermo-elastic Hydrodynamic Lubrication Bearing Model

作　　者：顾灿松 袁兆成[1] 杨征睿[2] 李洪亮 刘佳鑫[1] Gu Cansong;Yuan Zhaocheng;Yang Zhengrui;Li Hongliang;Liu Jiaxin(Jilin University,State Key Laboratory of Automotive Simulation and Control,Changchun 130022;China Automotive Technology and Research Center,Tianjin 300300)

机构地区：[1]吉林大学,汽车仿真与控制国家重点实验室,长春130022 [2]中国汽车技术研究中心,天津300300

出　　处：《汽车工程》2018年第3期326-332,共7页Automotive Engineering

基　　金：国防基础科研项目(B1420110034)资助。

摘　　要：本文中采用热弹流(TEHD)润滑轴承模型对一台三缸GDI发动机的振动噪声进行预测和优化。首先建立带TEHD轴承模型的发动机多体动力学模型,并对计算模型进行了实验验证。接着在此基础上,预测发动机辐射噪声性能,确定了影响发动机NVH性能的关键部件和关键频率。最后进行发动机NVH性能优化,优化后发动机辐射声功率级降低了1.3d B(A)。研究结果表明,所建高精度模型能更准确地确定影响发动机NVH性能的关键频率;而合理的优化能更有效地改善发动机NVH性能,从而大幅缩短发动机开发周期,降低开发成本,提升市场竞争力。The NVH performance of a three-cylinder GDI engine is predicted and optimized based on thermo-elastic hydrodynamic(TEHD)lubrication bearing model in this paper.Firstly a multi-body dynamics model for engine with TEHD bearing model is established and verified by experiment.Then based on this,the radiation noise performance of engine is predicted,and the key components and the critical frequencies,which influence engine NVH performance,are determined.Finally,an optimization of engine NVH performance is conducted,leading to a 1.3dB(A)reduction in the radiation sound power level of engine.The results of study show that the high accuracy model built can accurately identify the critical frequency affecting engine NVH performance,and reasonable optimization can more effectively improve engine NVH performance,and hence greatly reduce the lead time and cost of engine development and enhance its market competitiveness.

关 键 词：三缸汽油机 热弹流润滑 NVH性能 预测 优化 

分 类 号：U464[机械工程—车辆工程]